Re: Are there any "small" OEM BB crank pullies?
[Re: BradH]
#2722019
12/06/19 01:03 PM
12/06/19 01:03 PM
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Joined: Dec 2013
Posts: 4,669 Wichita
GY3
master
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master
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Wichita
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As in smaller than standard, but not as small as the Moroso cast pulley? What's wrong with the Moroso pulley? I run it on the street and never have any cooling issues.
'63 Dodge 330 11.19 @ 121 mph Pump gas, n/a, through the mufflers on street tires with 3.54's. 3,600 lbs. 10.01 @ 133mph with a 250 shot of nitrous an a splash of race gas. 1.36 60 ft. 3,700 lbs.
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Re: Are there any "small" OEM BB crank pullies?
[Re: BradH]
#2722029
12/06/19 01:25 PM
12/06/19 01:25 PM
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Joined: Jan 2003
Posts: 25,747 Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
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Posts: 25,747
Rio Linda, CA
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The smallest factory crank pulley I've seen is 6 1/4" in diameter and 2" high to the center of the V.
The INTERNET, the MISinformation superhighway
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Re: Are there any "small" OEM BB crank pullies?
[Re: GY3]
#2722035
12/06/19 01:52 PM
12/06/19 01:52 PM
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Joined: Jan 2003
Posts: 15,439 Val-haul-ass... eventually
BradH
OP
Taking time off to work on my car
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OP
Taking time off to work on my car
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
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As in smaller than standard, but not as small as the Moroso cast pulley? What's wrong with the Moroso pulley? I run it on the street and never have any cooling issues. Other people who have used the Moroso pulley have said they had cooling issues because of the reduced water pump speed, so I'm not 100% confident it's the way to go. I'll do some more research based on everyone's responses above.
Last edited by BradH; 12/06/19 01:53 PM.
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Re: Are there any "small" OEM BB crank pullies?
[Re: John_Kunkel]
#2722037
12/06/19 01:52 PM
12/06/19 01:52 PM
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Joined: Jan 2003
Posts: 1,237 North Central, Indiana
Roughbird72
pro stock
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pro stock
Joined: Jan 2003
Posts: 1,237
North Central, Indiana
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I'd have to check out the diameter of the March I've been running, I know it was smaller than the stock pulley. Mancini lists a crank pulley at 5.2"
Last edited by Roughbird72; 12/06/19 01:54 PM.
72 Plymouth Roadrunner 11.08@123.25
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Re: Are there any "small" OEM BB crank pullies?
[Re: BradH]
#2722078
12/06/19 04:43 PM
12/06/19 04:43 PM
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Joined: Jan 2005
Posts: 2,540 Milwaukee WI
TRENDZ
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Milwaukee WI
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I can build you a pulley in any configuration you want if you can supply the needed dimensions.
"use it 'till it breaks, replace as needed"
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Re: Are there any "small" OEM BB crank pullies?
[Re: TRENDZ]
#2722157
12/06/19 10:25 PM
12/06/19 10:25 PM
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Joined: Jan 2003
Posts: 9,985 Frostbitefalls MN (Rocky&Bullw...
gregsdart
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There is another company that makes beautifulreduced size pulleys for mopar, including crank, water pump and alternater pulleys. For the life of me i cant remember thier name, but they sure looked good on the 408 i built! I think they were out of Minnesota? Google aluminum pulleys and see what pops up.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: Are there any "small" OEM BB crank pullies?
[Re: gregsdart]
#2722234
12/07/19 09:35 AM
12/07/19 09:35 AM
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Joined: Jan 2003
Posts: 9,985 Frostbitefalls MN (Rocky&Bullw...
gregsdart
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If you decide to go aftermarket, TRENDZ (Rick) can make a nice piece that will give you the exact speed you want to run an alternater, etc at. He made a double for me for my bracket car that turned out very nice!
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: Are there any "small" OEM BB crank pullies?
[Re: BradH]
#2722293
12/07/19 01:36 PM
12/07/19 01:36 PM
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Joined: Jan 2003
Posts: 9,985 Frostbitefalls MN (Rocky&Bullw...
gregsdart
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Frostbitefalls MN (Rocky&Bullw...
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Off the top of my head...
Looks like OEM replicas are listed as 6.25"... about an inch wider in diameter than some of the aftermarket pulleys I found.
Not sure what diameter the Moroso is, only that it says a 30% reduction in pulley speed, IIRC. My brain hasn't shifted into calculator mode to reverse-engineer the diameter. To figure what i needed i took the max alternater rpm. As my target, then from the alternater pulley diameter and my max engine rpm i came up with the size pulley i needed. Since most all of us run more rpm at cruise than a stock setup it works well for the water pump also. Mymax rpm on the 408 was 6200 and a 5 inch pulley was about perfect. I had 3.55 gears and an auto.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: Are there any "small" OEM BB crank pullies?
[Re: BradH]
#2722348
12/07/19 04:50 PM
12/07/19 04:50 PM
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Joined: Feb 2005
Posts: 4,311 Prospect, PA
BSB67
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Not sure what diameter the Moroso is, only that it says a 30% reduction in pulley speed, IIRC. My brain hasn't shifted into calculator mode to reverse-engineer the diameter. .
Reduction will be directly proportional to diameter.
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Re: Are there any "small" OEM BB crank pullies?
[Re: BSB67]
#2722359
12/07/19 05:49 PM
12/07/19 05:49 PM
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Joined: Dec 2013
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GY3
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The Moroso is 5". Funny aside about the Moroso pully: I do my best to hide any aluminum and aftermarket mods in my engine compartment. I installed the aluminum pulley out of the package thinking it was buried to where no one would really see it. I went to a local cruise spot and literally the FIRST guy that walks up and looks at the engine points and says "Oh, it looks like you have an underdrive pulley!" I went home, ripped off the pulley and immediately painted it black!
'63 Dodge 330 11.19 @ 121 mph Pump gas, n/a, through the mufflers on street tires with 3.54's. 3,600 lbs. 10.01 @ 133mph with a 250 shot of nitrous an a splash of race gas. 1.36 60 ft. 3,700 lbs.
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